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Chris(aka-Moose), Subaru Technician
Category: Subaru
Satisfied Customers: 48685
Experience:  16 years of experience
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2004 Outback w/EJ251 2.5L SOHC w/ air injector injection,

Customer Question

2004 Outback w/EJ251 2.5L SOHC w/ air injector injection, 113K miles. Keep getting P0303 cylinder #3 misfire only during initial cold start up for 5-15 seconds. Once misfire clears, engine runs fine. New #3 spark plug, new #3 ignition wire, new coil pack, swapped #1 & #3 injectors & problem did not go with injector swap, compression 185 psi both #1 & #3 cylinders cold, checked valve clearance to Subaru service manual spec-ok, cleaned air injector injection system, cleaned throttle body, new MAP sensor & IAC. Head gaskets & front & rear O2 sensors recently replaced. What is the root cause of #3 misfire?
Submitted: 1 year ago.
Category: Subaru
Expert:  George H. replied 1 year ago.

Hello I will help you with your question,

Any coolant usage at all?

Have you pulled the #3 plug cold and looked inside the cylinder?

Customer: replied 1 year ago.
3 plug looks fine, just like #1. No signs of coolant.
Expert:  George H. replied 1 year ago.

Ok, then how long since the timing belt has been replaced?

Customer: replied 1 year ago.
Timing belt was replaced @ 75K miles.
Expert:  George H. replied 1 year ago.

How many miles now and why was the belt replaced so early?

I am unable to speak on the phone.

Customer: replied 1 year ago.
Purchased car for daughter going into Navy & replaced as reqular maintenance. She bought new car and it was returned.
Expert:  George H. replied 1 year ago.

I don't understand, how many miles are on it now and it was returned to you?

Customer: replied 1 year ago.
113,800 miles.
Expert:  George H. replied 1 year ago.

Ok, I don't think I am going to be able to help you from here. I would need to be hands on so I will OPT OUT

Sorry I could not help

Expert:  Chris(aka-Moose) replied 1 year ago.

Welcome, I'm Chris (aka Moose). Experts aren't employees / agents of Just Answer. We are independent service providers using the Site to sell their Expert knowledge to Customers. I strive to provide EXCELLENT 5 STAR service, let me know what's needed from me so your pleased.

The prior tech has opted out, would you like me to try and help?

Expert:  Chris(aka-Moose) replied 1 year ago.

I like to stay in contact with my customers. I assume you were not pleased with me or my answer since you did not rate it leaving me feedback. Just so you know we can still work on this issue. We can pick up where we left off or start over. I hate you paid all that money for your question deposit and have left not satisfied. Would any diagrams or repair guides or a phone call help?.

Thanks Chris